powerpc: Create next_tlbcam_idx percpu variable for FSL_BOOKE

This is used to round-robin TLBCAM entries.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/include/asm/mmu.h

@@ -115,6 +115,11 @@
 #ifndef __ASSEMBLY__
 #include <asm/cputable.h>
 
+#ifdef CONFIG_PPC_FSL_BOOK3E
+#include <asm/percpu.h>
+DECLARE_PER_CPU(int, next_tlbcam_idx);
+#endif
+
 static inline int mmu_has_feature(unsigned long feature)
 {
 	return (cur_cpu_spec->mmu_features & feature);

arch/powerpc/kernel/smp.c

@@ -305,6 +305,10 @@ struct thread_info *current_set[NR_CPUS];
 static void __devinit smp_store_cpu_info(int id)
 {
 	per_cpu(cpu_pvr, id) = mfspr(SPRN_PVR);
+#ifdef CONFIG_PPC_FSL_BOOK3E
+	per_cpu(next_tlbcam_idx, id)
+		= (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
+#endif
 }
 
 void __init smp_prepare_cpus(unsigned int max_cpus)

arch/powerpc/mm/mem.c

@@ -353,6 +353,15 @@ void __init mem_init(void)
 	}
 #endif /* CONFIG_HIGHMEM */
 
+#if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
+	/*
+	 * If smp is enabled, next_tlbcam_idx is initialized in the cpu up
+	 * functions.... do it here for the non-smp case.
+	 */
+	per_cpu(next_tlbcam_idx, smp_processor_id()) =
+		(mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
+#endif
+
 	printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
 	       "%luk reserved, %luk data, %luk bss, %luk init)\n",
 		nr_free_pages() << (PAGE_SHIFT-10),

arch/powerpc/mm/tlb_nohash.c

@@ -102,6 +102,12 @@ unsigned long linear_map_top;	/* Top of linear mapping */
 
 #endif /* CONFIG_PPC64 */
 
+#ifdef CONFIG_PPC_FSL_BOOK3E
+/* next_tlbcam_idx is used to round-robin tlbcam entry assignment */
+DEFINE_PER_CPU(int, next_tlbcam_idx);
+EXPORT_PER_CPU_SYMBOL(next_tlbcam_idx);
+#endif
+
 /*
  * Base TLB flushing operations:
  *